Sodium aurothiosulfate

Structural formula of sodium aurothiosulfate

Sodium aurothiosulfate is a chemical compound with the formula Na_Au(S_O_)_·2H_O. It is a coordination complex of gold and thiosulfate, and it is used in various applications, including photography and medicine.

Chemical Properties

Sodium aurothiosulfate is a water-soluble compound that forms a yellow solution. It is known for its ability to form stable complexes with gold ions, which makes it useful in gold extraction and recovery processes. The compound is typically prepared by reacting gold salts with sodium thiosulfate in an aqueous solution.

Applications

Photography

In photography, sodium aurothiosulfate is used as a fixing agent. It helps to dissolve unreacted silver halides from photographic films and papers, thereby stabilizing the image. This process is crucial in the development of photographs, ensuring that the image remains clear and does not degrade over time.

Medicine

Sodium aurothiosulfate has been studied for its potential use in medicine, particularly in the treatment of rheumatoid arthritis. It is believed to have anti-inflammatory properties, which can help alleviate the symptoms of this chronic condition. However, its use in medicine is limited due to potential side effects and the availability of more effective treatments.

Safety and Handling

Sodium aurothiosulfate should be handled with care, as it can be hazardous if ingested or inhaled. Proper protective equipment, such as gloves and goggles, should be worn when handling the compound. It should be stored in a cool, dry place, away from incompatible substances.

Related Pages

• Gold
• Thiosulfate
• Rheumatoid arthritis
• Photography

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